Commitments and Contingencies - Total Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 491	$ 281	$ 1,472	$ 761
Short-term lease cost	51	43	119	150
Variable lease cost	65	55	123	98
Total lease cost	$ 607	$ 379	$ 1,714	$ 1,009